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PI2161-EVAL1 Datasheet(PDF) 6 Page - Vicor Corporation |
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PI2161-EVAL1 Datasheet(HTML) 6 Page - Vicor Corporation |
6 / 8 page Picor Corporation • picorpower.com PI2161-EVAL1 User Guide Rev. 1.0 Page 6 of 8 current is sourced from the power supply and its output voltage will drop, but when the MOSFET disconnects the load (shorted) from the source, the bench power supply may produce high output voltage with high current capability that may damage the device under test. If a bench power supply has to be used, or there is some wiring inter connection between PI2161- EVAL1 input (Vin+ and Vin-) and the power source, add a large electrolytic capacitor between Vin+ and Vin- terminals to reduce power source high voltage transient after load disconnect. 6.2. Place the scope probes very close to PI2161 D pin and SH pin to measure Vout and Vin, and make sure that the scope ground leads are very short. 6.3. Current trip point: To find the exact current trip level, repeat steps 5.1 to 5.9 and then increment the load current slowly. The current can be monitored by a current probe placed at the unit input or by reading the current display at the power supply (PS1) or at the electronic load display. The actual trip current is the current right before the PI2161 turns the output off, VO output will go to 0V to indicate that the output is disconnect from the source. After PI2161 turns the output off by pulling the MOSFET gate low, it will hold the MOSFET in an off condition until it is reset. 6.4. Device Reset: To reset PI2161 after a fault (high load current), recycle PI2161 by sliding SW1 knob to Off position and then slide the knob back to On position. 6.5. Output short test Enable PS1 and then apply a short at the load (Vout). The short can be applied electronically using the electronic load, a MOSFET connected between Vout+ and Vout- or simply by connecting Vout+ to Vout-. Then measure the response time between when the output current reached the set trip point and when PI2161 disconnect the load. An example for PI2161 response time to an output short circuit is shown in Figure 5. Figure 5: Plot of PI2161 response time to a forward over-current condition 94.4ns Set Trip Current at 10.5A (Rs=200m Ω) Input Current (5A/div) Output Voltage [SH] (5V/div) PG pin (5V/div) Input Voltage [D] (5V/div) Start Turn off & latch MOSFET Avalanche At 69V 120.4ns Output Voltage [SH] (5V/div) Input Current (5A/div) Input Voltage [D] (5V/div) PG pin (5V/div) Turn off & latch Test Setup: DUT: PI2161-EVAL1 Vin = 45V Output Load = 1.5A Rs (R1) = 200mΩ First applied slow ramping load current and determined the trip current: 10.5A Test: Apply output short PI2161 was enabled and load current is at 1.5A, then shorted Vout+ to Vout- with a MOSFET. The current ramped at 230A/μs. PI2161 turned the output off at load current of 33A, by pulling the MOSFET gate low and latch it low. PI2161 internal MOSFET starts to turn off 94ns after the current reach the trip point (10.5A). And current reached 0A within 120ns. |
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